Network Bridge
A network bridge is a networking device or software component that connects two or more network segments at the data link layer (Layer 2) of the OSI model, forwarding traffic between them based on MAC addresses. It operates by learning which devices are on each segment and filtering traffic to reduce unnecessary broadcast domains, effectively creating a single logical network. Bridges are used to extend local area networks (LANs), improve performance by segmenting traffic, and connect networks with different physical media.
Developers should learn about network bridges when working with virtualization, containerization, or network infrastructure, as they are fundamental for connecting virtual machines, containers, or physical networks in environments like Docker, Kubernetes, or VMware. They are essential for scenarios requiring network segmentation, traffic isolation, or bridging between different network types, such as in cloud deployments or lab setups, to ensure efficient data flow and security.